Two-dimensional quadrupole ion trap operated as a mass spectrometer
First Claim
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1. A linear ion trap for trapping and subsequently ejecting ions comprising:
- at least four spaced substantially parallel elongated electrodes, said electrodes each including at least a front, a center and a back segment, said center segment of said electrodes defining there between an elongated trapping volume, said elongated trapping volume having a center axis, at least two of the at least four electrodes including an elongated slot, the first of the at least two slots defined by a first set of dimensions, the second of the at least two slots defined by a second set of dimensions, and the first set of dimensions having at least one dimension that is different from the second set of dimensions.
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Abstract
A three section linear or two-dimensional (2D) quadrupole ion trap as a high performance mass spectrometer is described. Mass analysis is performed by ejecting ions radically out slots formed in at least two of the rods using the mass selective instability mode of operation. The slot geometry is optimized to enable ions of different mass ranges to be scanned out of differently dimensioned slots. Multiple detectors arranged to receive ejected ions in multiple directions provide the ability to simultaneously or sequentially scan or perform mass analysis of ions of different natures.
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Citations
48 Claims
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1. A linear ion trap for trapping and subsequently ejecting ions comprising:
at least four spaced substantially parallel elongated electrodes, said electrodes each including at least a front, a center and a back segment, said center segment of said electrodes defining there between an elongated trapping volume, said elongated trapping volume having a center axis, at least two of the at least four electrodes including an elongated slot, the first of the at least two slots defined by a first set of dimensions, the second of the at least two slots defined by a second set of dimensions, and the first set of dimensions having at least one dimension that is different from the second set of dimensions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A mass spectrometer comprising:
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a linear ion trap for trapping and subsequently ejecting ions, said linear ion trap including at least four spaced substantially parallel elongated electrodes each including at least a front, a center and a back segment, said center segment of said electrodes defining therebetween an elongated trapping volume having a center axis, at least two of the at least four electrodes including an elongated slot, the first of the at least two slots defined by a first set of dimensions, the second of the at least two slots defined by a second set of dimensions, and the first set of dimensions having at least one dimension that is different from the second set of dimensions. means for introducing ions into said trapping volume to form an ion cloud; and
means for applying trapping and ejection voltages to selected electrode segments to trap and eject ions from said trap through said elongated slots. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for analyzing ions of at least two natures contained in a linear ion trap which comprises at least four spaced substantially parallel elongated electrodes, the electrodes each including at least a front, a center and a back segment, said center segment of said electrodes defining therebetween an elongated trapping volume, said elongated trapping volume having a center axis, at least two of the at least four electrodes including an elongated slot, and detector means associated with each slot for detecting ions which are ejected therefrom;
- the method comprising the step of having said detector means associated with each slot activated simultaneously.
- View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A method for analyzing ions of at least two natures contained in a linear ion trap which comprises at least four spaced substantially parallel elongated electrodes, the electrodes each including at least a front, a center and a back segment, said center segment of said electrodes defining therebetween an elongated trapping volume, said elongated trapping volume having a center axis, , at least two of the at least four electrodes including an elongated slot, and detector means associated with each of the slots for detecting ions which are ejected therefrom;
- the method comprising the step of having said detector means associated with each of the slots activated sequentially.
- View Dependent Claims (35, 36, 37, 38, 39)
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40. A linear ion trap and subsequently ejecting ions comprising:
at least four spaced substantially parallel elongated electrodes, said electrodes each including at least a front, a center and a back segment, said center segment of said electrodes defining there between an elongated trapping volume, said elongated trapping volume having a center axis of the at least four electrodes including an elongated slot defined by a set of dimensions, three of which having at least one dimension that is different from each other. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48)
Specification